Pencil-sharpener.



G. J. SENGBUSCH.

PENCIL SHARPENER.-

APPLlCATION FILED JULY' |912. 11,1 86,95 1 Patented June 13, 1916.

2 SHEETS-SHEET l.

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THE COLUMBIA PLANOGRAPH CD.. wAsmNoToN, D. C.

6.1. SENGBUSCH.

, PENCIL SHARPENEH.

APPLICATION men JULY-8. 1912.

1,186,951. 1 t PatendJune13,1916.

2 SHEETS-SHEET 2.V

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THE coLUM'BlA lfLMydGRAPH C0., WASHINGTON. D. C.

' construction and operation in a device of' GUsTavnJ. sENeBUscH, orMILWAUKEE, 'WisceNsINY lAssrGNeR To NEW ERA MFG.' co., OF NEW YORK, N.Y., A CORPORATION OF NEW' YORK.

PENCIL-SHARPENEB..

Liedern.l

My invention applies to that class of.

Sharpeners in which a cutting blade is reciprocated substantiallylongitudinally of the pencil in the sharpener, andV among the importantobjects ofthe invention areto provide a construction in which theknifewill be automatically vlifted to clear the pencil at each back stroke tothus avoid the tendency of the knife to kdraw `the pencil out of thechuck during'the back strokes;4

to pro-vide a grinding wheel for the knife built in as a part of theSharpener so that the knife can be ground; toV provide such arrangementthat the knife will be brought up to and under the action of thegrinding wheel at the end of each cutting stroke; to provide sucharrangement for the grinding wheel and knife that the knife will beactedV upon by the wheel for a certain time afterl each cutting Strokethereof; to provideim-V proved mechanism for effecting reciprocation ofthe knife blade supporting frame so that said frame is positively andaccurately moved in either direction; to provide im'- provedratchetanechanism for efectingstep by step rotation of the pencil; .andingen eral to provide improved and. more eiicient the class referred to.

The device illustrated on the accompanying drawings embodies the variousfeatures of vmy invention andV in these drawings Figure 1 iS a sideelevational view of' a Sharpener, Fig. 2 is a plan view thereof, Fig. 3is a sectional view' taken from plane 3 3' of Fig. 2; Fig. lis a frontend view of the knife bladek and its supporting frame, Fig. 5 is a planView of the knife' supporting frame, and Fig. 6 shows the mounting ofthe grindingwheel on its 'supporting axle.

The supporting structure for the sharpener comprises a cup-shaped frame1Q from;

whose sides extend the standards 11 and 12, and which has at its rear'end the diagonal extension 14E provided with a bore 15 for specificationof Leiters Patint.

Patented June 1.3, 191e.

, Application filed July 8,1912. Serial No. 708,161.

I receiving a pencil tobe sharpened, thetopi` of the extensionformingthe inclined guide Surface 16 for the cutting` blade 17. A'collar 18 supportedy across Vthe mouth ofthey borelsjournals a chuck 19carrying Springl clips20,k forclamping they pencil insertedV throughthechuck, the outer .flange of the chuckhavingratchet teeth 21 for coper-wating Awith the ratchet pawls to be described i later. .The bore 15terminates at its inner end atx'the opening 22 in fthe surface 16jthrough whichy opening.r the end of the pencil projects duringthe-sharpening op.- i

eration. Thelower end of the surface 16 leads to theinterior of the cupframe 10 to guide the Shavings thereto.' and a passagef4 way 23 leadsrfrom Opening 22 to carry the graphite cuttings to, `the cup.

. The extension lthas side plates 24' andy 25 secured theretowhichextend beyond the Surface 16k and at their upper edges are providedwithinwardly,extending flanges or guide tongues 26 .and 27 parallel withthe surface 16 and for receivingthe grooves 28 and 29 of the. block 30.This block has downwardly extending lugs 31 and 32 at its sides whichsupport af shaft 33 ony which is hinged the knife Supporting frame 34.The construction of this knife Supporting frame iS .best sho-wn in Figs.i and '5, the frame having the dove-tailed channel 35-in its lower Vfaceforireceiving the blade 17. A

slot 36 extending a 'distance rearwardly from the front end of theyframe,odivides the front end of thisv frame, and a clamping screw 37passing through y'the part 3e andv threading into the part 34 serves todraw these parts together tov securely clamp the blade in adjustedposition. f A compression spring 38 interposedl between the 'block30 andframe 3i tendsito hold the pointv of thc moved rearwardly, the frontendv ofthe ratchetlever is released fromk the lug 32 and the front endof the Vlever is swung arm downwardly and when'the block 30 is `i y Yforward strokeV of the knife blade the .part l ,of thepencil*.projectingy above the surface Y 1 engagementwith another ratchettooth. n

Y detent pawl 42 supported' from the plate 26 downwardly by the `41V and'the Lchuck with the pencil therein is given a Vrotational advancement.yy Y kward stroke of the block 30fthe lug 32 en-` gages withthe front`end of the ratchet klever to raisethe outer end 40 thereof foAr locksthechuck in positionafter ladvancement by the ratchet lever. During each16 is shaved off and the friction of the blade on the p'encilvwill ,keepthe pencil Lend at the innerendof thefbore untilthe pencil Ilias @beensharpenedall the' way 'around Vto correspond with thefconical lsurface15 of ythe' bore;

In order tov prevent the knife; fromdrawing out or (displacingk Ythepencil during back strokesprovisionis made to raise the knifepointtovclear the pencilduring such back strokes. vrThe shank` v37"ofscrewl 37 has yat-its ends sl'ots v451r and 46 extending extendslaterally cthrough the longitudinal `opening 43 in the side plate 24,and coperates with the cam plate 44.l` "This cam plate part-lyvertically, andl partly longitudinally `ofthe plate, screws 48 and49threaded into theside plate 24 receiving these slots.

spring' 50 secured tothe camfplate and to thesidev-'plate 2.4tends vtoAhold the cam plate lit-s outer position with the lower ends ofits'slots in-fengz'igement with the screws 48,1and`49, as shown in fulllines in Fig. 1.`j This is they position 'whenever the i @knife bladeisfrat the end yofpitsforward stroke, the upper surfac'e4`4 of the fcamplate vextending intojthe lopening43 and into fthe' pathof the outwardmovement of s thev screw shank '37', the front end 44" of this surfacel44 beingincludfed downwardly i .so that the knife blademay assume itslowermostr position. Thelouter end of the `cani I plate isfcut Vaway fora short distance to leave a shoulder 51 atthe outer end of the surfaceAls-the block 30 and with it. y'the knife `rframe' 34 fisl movedrearwardly the Vshank of screw37. will engage the inelinel 44 and' willireach the surface ,514', the knife supporting frame `44 being thus swungI upwardly to raise the-.knife edge Y above the surface16 and above thepencil fpart projecting throughopening 22, and this raised position oftheknife frame'is maintained until the screw 37 falls into the cutawaypart of the cam plate and behind theshoulder 51, the'knife edge thenV being in engagement with surface 16 ready for the next cutting stroke.

As the knife supporting structure is now moved forwardly the screw: 37will abut against' the shoulder lp-and will carry the vcam lplate44forwardly a distance until` the bends of the slfotsk45 'and v46 reachthe screws 48 and 49 Upon the for-V whereupon the screws 4S and 49 willreceive the vertical ends of the slots and the cam plate willdrop sothat its upper sur face 44"will be removed from t-he path of the screwshank 37 so that the blade edgek cam plate. As soon as the knifesupporting Structure reaches the end of its forward stroke and the screwshank 37 has yleft the top of the cam plate, spring 5() will raise thecam plate and will shift it back'to lits normal position so that it willagain form a rigid cam runway for t-he screw shank 37 during the nextback stroke ofk the knife supporting structure. Thus during`re'ciprocation of the knife supportcally raised to clear the pencilduring the back st-rokesand isy automatically brought into cuttingposit-ion during the forward strokes.

Coming now to the mechanism for reciprocating the knife supportingstructure, the standards 11 and 12 support at intermediate points theshaft 52 which between the standards is deflected to forni the crankloop` 53, the outer end of the shaft carrying the actuating'lever 54provided with the handle 55. Supported between the upper ends of thestandards 11 and 12 is a shaft 56 which pivots theswinging actuatorplate 57. This actuator plate has the arcuate arms V58 and 59 betweenwhose ends enters t-he lug 60 extending upwardly from the reciprocatingblock 30 of the knife supporting structure, this lug being engaged bythe arm 58 to cause back strokes of the knife supporting structure, andis engaged by the arm 59 to cause the forward strokes as the cam plate57 is swung forward and back. Extending through the arm 58 is a slot 61whose inner and outer surfaces 62 and 63 forni cam surfaces for the yoke53 of the crank loop 53, which yoke extends through the slot, 61. Theslot 61'eXtends along the arc of a circle and when the plate 57 is inone position theslot 61 and the cam surfaces 62 and 63`will beconcentric with the crank shaft so that the crank shaft 'may be rotatedthrough the extent of the slot without causing movement of the actuator.plate or of the knife mechanism. As shown, the slot 61 is ofsubstantially k180 degrees extent so that for each half revolution ofthe crank shaft the knifestructure willV be at rest and during theremaining revolution of the crank shaft the knife supporting `structurewill be reciprocated. Describing ing structure, the knife edge isautomatiposition indicated in dotted lines.

the operation more in detail, the ciankis rotated in vcounter-clock(Fig. 3). reaches the upper end of slot 61 it will. upon kfurthermovement, engagev with the cam surface 62 to swing the actuator platetoward the left so that the knife support ing structure is movedoutwardly to the After the actuator plate has been swung to itsroutermost position toward the left, the crank yoke will engage with thecam sur- 63 and the actuator plate will be swung toward the right andthe knife supporting structure will be swung inwardly by the arm 59. Atthe end of such inward movement the slot 61 is concentric with the crankshaft and although the crank shaft con tinues to revolve there will beno further movement of the knife supporting structure until thecrankyoke again reaches the outer endof slot 61, and the arcuate lengthof the slot determines the length of this vperiod of rest of the knifesupporting structure.

Sharpening means are provided for acting on the knife blade during eachof the intervals of rest of the knife supporting structure and as shown,such sharpening means comprises a grinding wheel 64 mounted on a shaft65 journaled in the sides of a yokeframe 66 whose ends are pivoted onthe crank shaft so that the yoke frame tol gether with the wheel mayswing. The shaft 65 extends laterally through the elongated opening 67in the standard 12 and at its outer end carries the pinion 68 whichmeshes with the gear 69 mounted on the crank shaft. Thus during rotationof the shaft the grinding wheel will be rotated and at the same time thewheel is free to swing bodily through a distance limited by the lengthof the opening 67. The wheel is p0- sitioned to engage with the knifeblade end when the knife supporting structure is at the end of itsforward stroke so that during the time that the crank yoke is coperatingwith the slot 61 the wheel will be grinding and sharpening the blade.When the knifbe is withdrawn the wheel will move downwardly and when theknife is moved forwardly it irst raises the grinding wheel so thatduring the grinding interval the weight'of the wheel and yoke willsupply the necessary pressure to effect efficient grinding. Thus aftereach cutting stroke of the knife, the knife will be ground andthoroughly sharpened and during the sharpening period the knifesupporting structure is rigidly held in place by the actuator cam whichis locked against movement by the crank loop engaging in the slot 61while said slot is concentric with the crank shaft.

I thus provide a very eiiicient pencil wise "directionv As soonas thecrankyoke V53 Sharpener in which the knife issharpened duringoperation'of the cutter'and before or after each cutting operation, andin which the knife is prevented' from engaging with the pencil duringthereturn strokes so that the pencil will not become displaced. rIlhe knifesupporting structure is positively moved both forward'and back and isrigidly held duringfthe'timethat the knife is acted v upon by Vthesharpening mechanism.

I do not, of course, desire to be limited to the exact construction andarrangement shown and described as modifications can be made which wouldstill comevwithin the scopeV of the inventionV and I claim`thekfollowing:

1. In a pencil sharpening device, the comv bination cfa support foi"apencil, a cutting blade, asupporting structure for said bladereciprocable to effect cutting engagement of said bladewith saidpencil,a crank shaft, means intervening betweensaid crank shaftv andknife blade supporting structure for causing reciprocation of saidsupporting structure during only part of each revolution of the crankshaft, said supporting structure being at rest during the remainder ofeach revolution of thecrank shaft, and sharpening means controlled bythe rotation of said crank shaft to c'operate with the blade during suchperiod of rest of the of said structure during only part of eachrevolution of said rotating member, said supporting structure being atrest .during the remainder of each revolution, and a sharpening memberdriven by said rotating member to sharpen the blade during suchintervals of rest structure.

3. In a pencil sharpening device, the'combination of a supportV forpencils to be sharpened, a supporting structure recipro# cableon saidsupportandfcarrying a knife"VV blade, a crank pin, meansffor revolvingsaid crank pin, a cam member interposed between said crank pin andsupporting structure and having cam surfaces to be engaged by said crankpin to effect reciprocation of said structure during only part of eachrevolution of said crank pin, and grinding mecha-y nism cooperating withsaid blade during ofthe blade supporting the remainder of eachrevolution of said pin. a. In a pencil sharpening device, the comfbination of a support for pencils to rbe sharpened, a frame reciprocableon saidlsup-y port and carrying a knife blade, a crank pin to `the`cranklpin .and having a cam'slot for receiving Vsaid p1n,gsa1d cam slotbeing cony centric Withthe axis of revolution of said pinwhen said camvmember is in one positiony 1Wherebyl said cammember Will remainstationaryy during engagementfof said crank y pin in "saidslot at suchtime, abutments on `10 said cam member Vcoperating with said frametoeffect reciprocation thereofas said cam member is `swung aftersaidcrank pin .reachesthe'end yof said cam slot, and means for; grindingsaid blade during saidv period Whenthecam member, is stationary.

5. In a pencilsharpening device, the combination of a support forpencils to be sharpened, v'a frame reciprocable von said support andcarrying la knife blade, a crank pin andvmean's for revolving/same, aswinging cam member havingabutments for coperating with' saidframe'toeffect reciprocation thereof during swing of the cam member, means,Connecting said cam member with said crank pin to effect swing-'of saidcam member during only part of each revolution of said crank pin, and tohold it stationary during the remainder of the revolution, and

1 means forgrinding said blade When the cam member is at rest.

` 6. In -a pencil sharpeningdevice, the combination of a support Vforpencils to be sharpened, a framefreciprocable on said support andcarryingav knife blade, a crank pin and 'means for revolving sameaswinging cam memberv havingfabutments for coperatingy With said frame toeffect reciprocaktion thereof during swing Yof the cam member, meansconnecting said. cam member with said Vcrank pinto yeffect swing of saidcam member during only partY of each revolution of said crank pin,and acontinuously .rotating vgrinding Wheel engaged by the thepencilholder; acutter mounted to recip- .Y Genies ofi-.this patent may be obtained forrecate. in coperative relation to the pencil 1,186,951"V l Y holder.;actuating means mounted on the overhanging supports; and connectionsbetween the actuating means and the cutter and pencil holder foractuating the same; and a cutter YSharpener freely suspended on theoverhanging supports and swinging into cooperative relation with thecutter, Whereby the latter may be sharpened at the end of its cuttingstroke. f

8. In a pencil sharpening device, the combination of a support yforpencils to be sharpened, avsupporting structure reciprocable on saidsupport and carrying a knife blade, a crank shaft, cam mechanismconnecting between said crank shaft and supporting structure for causingreciprocationl of said structure, a frame hung from said crank shaft, agrinding Wheel journaled in said frame, and means for causing engagementof said blade and Wheel after each cutting operation of said blade.

9. In a pencil sharpening device, the combination .of a support forpencils to be sharpened, a supporting structure reciprocable on saidsupport and carrying a knife blade, a crank shaft, vcam mechanismconnecting with said crank shaft and supporting structure and adaptedupon rotation of said crank shaft to cause reciprocation of saidstructure to sharpen the pencil, a grinding Wheel having drivenconnection with said crank shaft and disposed to be engaged by thevknifeblade at the end of each cut-y ting stroke and prior to the returnstroke.

1,0. In aY pencil sharpening device, the

vcombination of a support for pencils to be sharpened, a reciprocatingsupport carrying a'knife, means for reciprocating said support torcarrythe knife back and forth over a pencil to be sharpened, a grinding Wheeloperating in the path of movement of the knife and near the end of saidpath, and

means for actuating said Wheel, whereby the knife, as it nears the endof its cutting movement, engages said Wheel and issharpened thereby. n

vIn Witness. whereof, I hereunto subscribe my name,this 8rd day of July,A. I). 1912.

GUSTAVE J. SENGBUSCH. Witnesses i H. B. BERENDSEN, H. L. KLATT.

ve cents each, by addressing' the Commissioner of.Patents, Washington,D. C.

